What is it?

I don’t know what to think. According to this app I’m supposed to start my period today. No sign of it, instead I’m spotting. Not enough to wear a panty liner or tampon tho. It just comes out a very tiny bit when peeing and when wiping. I’m having slight cramping a pressure in my lower pelvic area.

I’ve been spotting on and off since Tuesday it was light brown, light red, and today it’s browish/red.

Any idea? I’m 10 dpo cycle day 21. And me cycle is normal 20 days or less as I have irregular periods.